diff options
Diffstat (limited to 'tex/context/base/syst-pln.tex')
| -rw-r--r-- | tex/context/base/syst-pln.tex | 289 |
1 files changed, 145 insertions, 144 deletions
diff --git a/tex/context/base/syst-pln.tex b/tex/context/base/syst-pln.tex index bf2cc1e60..becf67f83 100644 --- a/tex/context/base/syst-pln.tex +++ b/tex/context/base/syst-pln.tex @@ -8,24 +8,24 @@ %D copyright={PRAGMA / Hans Hagen \& Ton Otten}] %C %C This module is part of the \CONTEXT\ macro||package and is -%C therefore copyrighted by \PRAGMA. See mreadme.pdf for -%C details. +%C therefore copyrighted by \PRAGMA. See mreadme.pdf for +%C details. %D We used to load plain \TEX\ in a special way, but redefining %D a couple of primitives so that for instance font loading was -%D ignored. For those interested, this loader is found in -%D \type {syst-tex.tex}. +%D ignored. For those interested, this loader is found in +%D \type {syst-tex.tex}. %D This is a stripped down version of plain \TEX. We need this %D module to get started. Whole sections are missing here, %D like font loading and math. Thise are taken care of in -%D dedicated modules. A few definitions are added (and -%D marked as such). +%D dedicated modules. A few definitions are added (and +%D marked as such). %D Characters can have special states, that can be triggered %D by setting their category coded. Some are preset, others %D are to be set as soon as possible, otherwise we cannot -%D define any useful macros. +%D define any useful macros. %catcode`\^^@ = 9 % ascii null is ignored %catcode`\\ = 0 % backslash is TeX escape character @@ -45,44 +45,44 @@ %catcode`\^^? = 15 % ascii delete is invalid \catcode`\~ = 13 % tilde is active -\catcode`\^^L = 13 % ascii form-feed +\catcode`\^^L = 13 % ascii form-feed -%catcode`\A = 11 +%catcode`\A = 11 %....... %catcode`\Z = 11 -%catcode`\a = 11 +%catcode`\a = 11 %....... -%catcode`\z = 11 +%catcode`\z = 11 -\chardef\active = 13 +\chardef\active = 13 -\def ^^L{\par} +\def ^^L{\par} \def\^^M{\ } % control <return> = control <space> \def\^^I{\ } % same for <tab> %D In \CONTEXT, we simply ignore end||of||file tokens: - + \catcode`\^^Z=9 -%D First we define a simplified version of the \CONTEXT\ +%D First we define a simplified version of the \CONTEXT\ %D protection mechanism. \def\unprotect{\catcode`@=11} \def\protect {\catcode`@=12} -\unprotect +\unprotect -%D We do not set up mathcodes here, but postpone that to the -%D math modules. +%D We do not set up mathcodes here, but postpone that to the +%D math modules. \mathcode`\ = "8000 % \space \mathcode`\' = "8000 % ^\prime \mathcode`\_ = "8000 % \_ \mathcode`\^^? = "1273 % \smallint -\sfcode`\)=0 -\sfcode`\'=0 +\sfcode`\)=0 +\sfcode`\'=0 \sfcode`\]=0 \chardef\@ne = 1 @@ -96,33 +96,33 @@ \mathchardef\@M = 10000 \mathchardef\@MM = 20000 -%D Pretty important definitions: +%D Pretty important definitions: -\let\bgroup={ +\let\bgroup={ \let\egroup=} %D In plain \TEX\ the following explanation about the register -%D allocation mechanism is given: +%D allocation mechanism is given: %D -%D \startsmaller +%D \startnarrower %D The following counters are reserved: %D -%D \starttabulatie -%D \NC 0--9 \NC page numbering \NC \NR -%D \NC 10 \NC count allocation \NC \NR -%D \NC 11 \NC dimen allocation \NC \NR -%D \NC 12 \NC skip allocation \NC \NR -%D \NC 13 \NC muskip allocation \NC \NR -%D \NC 14 \NC box allocation \NC \NR -%D \NC 15 \NC toks allocation \NC \NR -%D \NC 16 \NC read file allocation \NC \NR -%D \NC 17 \NC write file allocation \NC \NR -%D \NC 18 \NC math family allocation \NC \NR -%D \NC 19 \NC language allocation \NC \NR -%D \NC 20 \NC insert allocation \NC \NR -%D \NC 21 \NC the most recently allocated number \NC \NR -%D \NC 22 \NC constant $-1$ \NC \NR -%D \stoptabulatie +%D \starttabulate +%D \NC 0--9 \NC page numbering \NC \NR +%D \NC 10 \NC count allocation \NC \NR +%D \NC 11 \NC dimen allocation \NC \NR +%D \NC 12 \NC skip allocation \NC \NR +%D \NC 13 \NC muskip allocation \NC \NR +%D \NC 14 \NC box allocation \NC \NR +%D \NC 15 \NC toks allocation \NC \NR +%D \NC 16 \NC read file allocation \NC \NR +%D \NC 17 \NC write file allocation \NC \NR +%D \NC 18 \NC math family allocation \NC \NR +%D \NC 19 \NC language allocation \NC \NR +%D \NC 20 \NC insert allocation \NC \NR +%D \NC 21 \NC the most recently allocated number \NC \NR +%D \NC 22 \NC constant $-1$ \NC \NR +%D \stoptabulate %D %D New counters are allocated starting with 23, 24, etc. Other %D registers are allocated starting with 10. This leaves 0 @@ -138,17 +138,17 @@ %D lowest-numbered insert that has been allocated. Of course, %D \type {\box255} is reserved for \type {\output}; \type %D {\count255}, \type {\dimen255}, and \type {\skip255} can be -%D used freely. -%D +%D used freely. +%D %D It is recommended that macro designers always use \type %D {\globa}l assignments with respect to registers numbered 1, %D 3, 5, 7, 9, and always non||\type {\global} assignments %D with respect to registers 0, 2, 4, 6, 8, 255. This will %D prevent \quote {save stack buildup} that might otherwise -%D occur. -%D \stopsmaller +%D occur. +%D \stopnarrower %D -%D We well overload some macros in \ETEX\ mode. +%D We well overload some macros in \ETEX\ mode. \count10 = 22 % allocates \count registers 23, 24, ... \count11 = 9 % allocates \dimen registers 10, 11, ... @@ -165,14 +165,14 @@ \countdef\insc@unt = 20 % the insertion counter \countdef\allocationnumber= 21 % the most recent allocation \countdef\m@ne = 22 % a handy constant - \m@ne = -1 + \m@ne = -1 \def\wlog{\immediate\write\m@ne} % write on log file (only) -%D \startsmaller +%D \startnarrower %D Here are abbreviations for the names of scratch registers %D that don't need to be allocated. -%D \stopsmaller +%D \stopnarrower \countdef \count@ = 255 \dimendef \dimen@ = 0 @@ -181,15 +181,15 @@ \skipdef \skip@ = 0 \toksdef \toks@ = 0 -%D \startsmaller +%D \startnarrower %D Now, we define \type {\newcount}, \type {\newbox}, etc. so %D that you can say \newcount\foo and \type {\foo} will be %D defined (with \type {\countdef}) to be the next counter. To %D find out which counter \type {\foo} is, you can look at %D \type {\allocationnumber}. Since there's no \type {\boxdef} %D command, \type {\chardef} is used to define a \type -%D {\newbox}, \type {\newinsert}, \type {\newfam}, and so on. -%D \stopsmaller +%D {\newbox}, \type {\newinsert}, \type {\newfam}, and so on. +%D \stopnarrower \def\newcount {\alloc@0\count \countdef \insc@unt} \def\newdimen {\alloc@1\dimen \dimendef \insc@unt} @@ -226,35 +226,35 @@ \errmessage{No room for a new #3} \fi} -\newdimen\maxdimen \maxdimen = 16383.99999pt -\newskip \hideskip \hideskip = -1000pt plus 1fill +\newdimen\maxdimen \maxdimen = 16383.99999pt +\newskip \hideskip \hideskip = -1000pt plus 1fill \newskip \centering \centering = 0pt plus 1000pt minus 1000pt -\newdimen\p@ \p@ = 1pt -\newdimen\z@ \z@ = 0pt +\newdimen\p@ \p@ = 1pt +\newdimen\z@ \z@ = 0pt \newskip \z@skip \z@skip = 0pt plus 0pt minus 0pt \newbox \voidb@x % permanently void box register -%D We define \type {\newif} a la plain \TEX, but will -%D redefine it later. As Knuth says: +%D We define \type {\newif} a la plain \TEX, but will +%D redefine it later. As Knuth says: +%D +%D \startnarrower +%D And here's a different sort of allocation: for example, %D -%D \startsmaller -%D And here's a different sort of allocation: for example, +%D \starttyping +%D \newif\iffoo +%D \stoptyping %D -%D \starttypen -%D \newif\iffoo -%D \stoptypen -%D -%D creates \type {\footrue}, \type {\foofalse} to go +%D creates \type {\footrue}, \type {\foofalse} to go %D with \type {\iffoo}. -%D \stopsmaller +%D \stopnarrower \def\newif#1% - {\count@\escapechar + {\count@\escapechar \escapechar\m@ne \expandafter\expandafter\expandafter\def\@if #1{true}{\let#1\iftrue }% \expandafter\expandafter\expandafter\def\@if#1{false}{\let#1\iffalse}% \@if#1{false}% the condition starts out false - \escapechar\count@} + \escapechar\count@} \def\@if#1#2% {\csname\expandafter\if@\string#1#2\endcsname} @@ -265,7 +265,7 @@ \egroup -%D Build||in numeric variables. +%D Build||in numeric variables. \adjdemerits = 10000 \binoppenalty = 700 @@ -277,21 +277,21 @@ \delimiterfactor = 901 \displaywidowpenalty = 50 \doublehyphendemerits = 10000 -%endlinechar = `\^^M -\errorcontextlines = 5 -%escapechar = `\\ +%endlinechar = `\^^M +\errorcontextlines = 5 +%escapechar = `\\ \exhyphenpenalty = 50 %fam = 0 \finalhyphendemerits = 5000 %floatingpenalty = 0 %globaldefs = 0 -%hangafter = 1 +%hangafter = 1 \hbadness = 1000 %holdinginserts = 0 \hyphenpenalty = 50 %interlinepenalty = 0 %language = 0 -\lefthyphenmin = 2 +\lefthyphenmin = 2 \linepenalty = 10 %looseness = 0 %mag = 1000 @@ -308,7 +308,7 @@ \showboxbreadth = 5 \showboxdepth = 3 %time = 0 -\tolerance = 200 +\tolerance = 200 %tracingcommands = 0 \tracinglostchars = 1 %tracingmacros = 0 @@ -323,15 +323,15 @@ \widowpenalty = 150 %year = 0 -%D Extra numeric variables. +%D Extra numeric variables. -\newcount \interdisplaylinepenalty -\newcount \interfootnotelinepenalty +\newcount \interdisplaylinepenalty +\newcount \interfootnotelinepenalty \interdisplaylinepenalty = 100 \interfootnotelinepenalty = 100 -%D Build in dimension variables. +%D Build in dimension variables. \abovedisplayshortskip = 0pt plus 3pt \abovedisplayskip = 12pt plus 3pt minus 9pt @@ -372,15 +372,15 @@ \vsize = 8.9in %xspaceskip = 0pt -%D Extra dimension parameters. +%D Extra dimension parameters. -\newskip \bigskipamount -\newdimen \jot -\newskip \medskipamount -\newskip \normalbaselineskip -\newskip \normallineskip -\newdimen \normallineskiplimit -\newskip \smallskipamount +\newskip \bigskipamount +\newdimen \jot +\newskip \medskipamount +\newskip \normalbaselineskip +\newskip \normallineskip +\newdimen \normallineskiplimit +\newskip \smallskipamount \bigskipamount = 12pt plus 4pt minus 4pt \jot = 3pt @@ -390,15 +390,15 @@ \normallineskiplimit = 0pt \smallskipamount = 3pt plus 1pt minus 1pt -%D The following shortcuts are rather standard: +%D The following shortcuts are rather standard: -\def\lq{`} +\def\lq{`} \def\rq{'} -\def\lbrack{[} +\def\lbrack{[} \def\rbrack{]} -\let\endgraf=\par +\let\endgraf=\par \let\endline=\cr \def\space{ } @@ -406,46 +406,47 @@ \def\null {\hbox{}} %D The next loop construct is about the fastest you can get. -%D Beware: this macro does not support nested loops. +%D Beware: this macro does not support nested loops. We use +%D a namespace prefix \type {@@pln}. -\long\def\loop#1\repeat{\long\def\body{#1}\iterate} +\long\def\loop#1\repeat{\long\def\@@plnbody{#1}\@@plniterate} -%D The following makes \type {\loop} \unknown\ \type {\if} -%D \unknown\ \type {\repeat} skippable: +%D The following makes \type {\loop} \unknown\ \type {\if} +%D \unknown\ \type {\repeat} skippable (clever trick): -\let\repeat=\fi +\let\repeat=\fi -%D The original: +%D The original (no \type {@@pln} there): -\def\iterate{\body\let\next\iterate\else\let\next\relax\fi\next} +\def\@@plniterate{\@@plnbody\let\next\@@plniterate\else\let\next\relax\fi\next} -%D A more efficient alternative: +%D A more efficient alternative: -\def\iterate{\body\expandafter\iterate\else\expandafter\relax\fi} +\def\@@plniterate{\@@plnbody\expandafter\@@plniterate\else\expandafter\relax\fi} -%D An even more efficient one: +%D An even more efficient one: -\def\iterate{\body\expandafter\iterate\else\fi} +\def\@@plniterate{\@@plnbody\expandafter\@@plniterate\else\fi} %D Counter 0 is normally used as page counter: \countdef\pageno=0 \pageno=1 % first page is number 1 %D Beside the raw counter \type {\pageno} the \type {\folio} -%D macro provides the value. +%D macro provides the value. \def\folio{\the\pageno} -%D Indeed, we don't define a real output routine yet: +%D Indeed, we don't define a real output routine yet: \output{\box255} -%D We don't support \type {\magnification} and just consume -%D the value. +%D We don't support \type {\magnification} and just consume +%D the value. \let\magnification\count@ -%D The following macro will be overloaded in \ETEX. +%D The following macro will be overloaded in \ETEX. \def\tracingall {\tracingonline \@ne @@ -461,8 +462,8 @@ \showboxdepth \maxdimen \errorstopmode} -%D Some users expect this macro to be present. This one -%D sends the hyphenated word to the terminal. +%D Some users expect this macro to be present. This one +%D sends the hyphenated word to the terminal. \def\showhyphens#1% {\setbox0\vbox @@ -471,31 +472,31 @@ \pretolerance\m@ne \tolerance\m@ne \hbadness0 - \showboxdepth0 + \showboxdepth0 \ #1}} %D The following bunch of macros deals with basic alignment. -%D We just include them here so that they can be used if -%D needed. Normally, \CONTEXT\ users will fall back on one of -%D the three table environments. +%D We just include them here so that they can be used if +%D needed. Normally, \CONTEXT\ users will fall back on one of +%D the three table environments. \newcount \mscount -\newif \ifus@ +\newif \ifus@ \newif \if@cr -\newbox \tabs -\newbox \tabsyet +\newbox \tabs +\newbox \tabsyet \newbox \tabsdone \def\hidewidth % for alignment entries that can stick out - {\hskip\hideskip} + {\hskip\hideskip} \def\ialign % initialized \halign {\everycr{} \tabskip\z@skip - \halign} + \halign} \def\multispan#1% - {\omit + {\omit \mscount#1\relax \loop \ifnum\mscount>\@ne \sp@n @@ -507,43 +508,43 @@ \advance\mscount\m@ne} \def\cleartabs - {\global\setbox\tabsyet\null + {\global\setbox\tabsyet\null \setbox\tabs\null} \def\settabs - {\setbox\tabs\null + {\setbox\tabs\null \futurelet\next\sett@b} \def\sett@b - {\ifx\next\+% + {\ifx\next\+% \def\nxt{\afterassignment\s@tt@b\let\nxt}% \else \let\nxt\s@tcols - \fi - \let\next\relax + \fi + \let\next\relax \nxt} -\def\s@tt@b% - {\let\nxt\relax +\def\s@tt@b% + {\let\nxt\relax \us@false\m@ketabbox} -\def\tabalign% - {\us@true\m@ketabbox} +\def\tabalign% + {\us@true\m@ketabbox} -\let\+\tabalign % no outer here +\let\+\tabalign % no outer here \def\s@tcols#1\columns% {\count@#1% \dimen@\hsize \loop - \ifnum\count@>\z@ \@nother + \ifnum\count@>\z@ \@nother \repeat} \def\@nother% - {\dimen@ii\dimen@ + {\dimen@ii\dimen@ \divide\dimen@ii\count@ \setbox\tabs\hbox{\hbox to\dimen@ii{}\unhbox\tabs}% - \advance\dimen@-\dimen@ii + \advance\dimen@-\dimen@ii \advance\count@\m@ne} \def\m@ketabbox% @@ -564,8 +565,8 @@ {\if@cr \egroup % now \box\z@ holds the column \else - \hss\egroup - \global\setbox\tabsyet\hbox + \hss\egroup + \global\setbox\tabsyet\hbox {\unhbox\tabsyet\global\setbox\@ne\lastbox}% now \box\@ne holds its size \ifvoid\@ne \global\setbox\@ne\hbox to\wd\z@{}% @@ -576,7 +577,7 @@ \fi \box\z@} -%D Users are advised not to use the following macros: +%D Users are advised not to use the following macros: \def\hang {\hangindent\parindent} @@ -590,11 +591,11 @@ {\advance\leftskip \parindent \advance\rightskip\parindent} -%D Useful, used too, but sometimes dangerous: +%D Useful, used too, but sometimes dangerous: -\def\leavevmode{\unhbox\voidb@x} +\def\leavevmode{\unhbox\voidb@x} -%D We will overload these, but may need them beforehand: +%D We will overload these, but may need them beforehand: \bgroup \catcode`\^^M=\active% @@ -615,27 +616,27 @@ \chardef\#=`\# \chardef\$=`\$ -\def\_{\leavevmode \kern.06em \vbox{\hrule width.3em}} +\def\_{\leavevmode \kern.06em \vbox{\hrule width.3em}} -%D Used at all? +%D Used at all? \def\slash{/\penalty\exhyphenpenalty} % a `/' that acts like a `-' -%D Replaced later on: +%D Replaced later on: \def\line {\hbox to\hsize} \def\leftline #1{\line{#1\hss}} \def\rightline #1{\line{\hss#1}} \def\centerline#1{\line{\hss#1\hss}} -%D These are used by TaBlE: +%D These are used by TaBlE: \newif\ifh@ \newif\ifv@ -%D Let's end in the plain way: +%D Let's end in the plain way: \def\fmtname {ConTeXt Minimized Plain TeX} -\def\fmtversion{3.1415926} +\def\fmtversion{3.1415926} -\protect \endinput +\protect \endinput |